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Closed-circuit television (CCTV), also known as video surveillance,[1][2] is the use of video cameras to transmit a signal to a specific place, on a limited set of monitors. It differs from broadcast television in that the signal is not openly transmitted, though it may employ point-to-point (P2P), point-to-multipoint (P2MP), or mesh wired or wireless links. Even though almost all video cameras fit this definition, the term is most often applied to those used for surveillance in areas that require additional security or ongoing monitoring (Videotelephony is seldom called "CCTV"[3][4]). Surveillance of the public using CCTV is common in many areas around the world. Video surveillance has generated significant debate about balancing its use with individuals' right to privacy even when in public.[5][6][7] In industrial plants, CCTV equipment may be used to observe parts of a process from a central control room, especially if the environments observed are dangerous or inaccessible to humans. CCTV systems may operate continuously or only as required to monitor a particular event. A more advanced form of CCTV, using digital video recorders (DVRs), provides recording for possibly many years, with a variety of quality and performance options and extra features (such as motion detection and email alerts). More recently, decentralized IP cameras, perhaps equipped with megapixel sensors, support recording directly to network-attached storage devices, or internal flash for completely stand-alone operation. By one estimate, there will be approximately 1 billion surveillance cameras in use worldwide by 2021.[8][needs update] About 65% of these cameras are installed in Asia. The growth of CCTV has been slowing in recent years.[9][unreliable source?] The deployment of this technology has facilitated significant growth in state surveillance, a substantial rise in the methods of advanced social monitoring and control, and a host of crime prevention measures throughout the world.[10]A security alarm is a system designed to detect intrusions, such as unauthorized entry, into a building or other areas, such as a home or school. Security alarms protect against burglary (theft) or property damage, as well as against intruders. Examples include personal systems, neighborhood security alerts, car alarms, and prison alarms. Some alarm systems serve a single purpose of burglary protection; combination systems provide fire and intrusion protection. Intrusion-alarm systems are combined with closed-circuit television surveillance (CCTV) systems to record intruders' activities and interface to access control systems for electrically locked doors. There are many types of security systems. Homeowners typically have small, self-contained noisemakers. These devices can also be complicated, multirole systems with computer monitoring and control. It may even include a two-way voice which allows communication between the panel and monitoring station.
Gloucestershire (/ˈɡlɒstərʃər/ ⓘ GLOST-ər-shər, /-ʃɪər/ -sheer; abbreviated Glos.)[1] is a ceremonial county in South West England. It is bordered by Herefordshire to the north-west, Worcestershire to the north, Warwickshire to the north-east, Oxfordshire to the east, Wiltshire to the south, Bristol and Somerset to the south-west, and the Welsh county of Monmouthshire to the west. The city of Gloucester is the largest settlement and the county town.
The county is predominantly rural, with an area of 3,150 square kilometres (1,220 sq mi) and a population of 916,212. After Gloucester (118,555) the largest distinct settlements are Cheltenham (115,940), Stroud (26,080), and Yate (28,350).[2] In the south of the county, the areas around Filton and Kingswood are densely populated and part of Bristol built-up area. For local government purposes Gloucestershire comprises a non-metropolitan county, with six districts, and the unitary authority area of South Gloucestershire.
Gloucestershire is bisected by the river River Severn, which enters the county near Tewkesbury and forms a wide valley down its centre before broadening into a large tidal estuary. The hills to the east form the majority of the Cotswolds AONB, and the uplands to the west are part of the Forest of Dean and the Wye Valley AONB, which stretches into Wales.
Gloucestershire was likely established in the tenth century, and expanded to approximately its current borders in the eleventh. The county was relatively settled during the late Middle Ages, and contained several wealthy monasteries such as Tewkesbury, Gloucester, Hailes, and Cirencester; the Forest of Dean was also a major iron-producing region in this period. The city of Bristol became an independent county in 1373, by which point it was the third-largest in England. The county was not heavily industrialised during the Industrial Revolution, however the Port of Gloucester was expanded with new docks and the small Forest of Dean coalfield was exploited
